摘要
为研究水泥砂浆固化土剪切强度特性和合理确定水泥砂浆固化土工程应用的配比,从掺砂量、水泥掺入比、原料土含水率及砂料粒径入手,对水泥砂浆固化土进行了室内固结不排水三轴(CU)试验研究。结果表明,掺砂可以改善固化土强度;随掺砂量的增加,黏聚力和有效黏聚力先增加后减小,转折点的掺砂量为最佳掺砂量(10%左右),内摩擦角和有效内摩擦角不断增加,一定掺砂量下增加水泥掺入比可有效地提高固化土的强度;随着含水率的增加,固化土的黏聚力呈近似线性减小的关系,而内摩擦角几乎保持不变,采用水泥砂浆处理高含水率软弱地基时适当提高掺砂量,可以较大幅度改善固化土的力学性质;在掺料配比一定的情况下砂料粒径对固化土的抗剪强度指标存在一定的影响。采用单一粒径砂料的固化土抗剪强度更高,该单一粒径在固化土级配良好的前提下,不均匀系数Cu趋于最大、曲率系数Cc趋于最小。
In order to study the features of shear strength of soils stabilized by cement mortar,to provide a theoretical reference to rationally determine the engineering application ratio of soils stabilized by cement mortar,some CU triaxial tests are performed on the soils stabilized by cement mortar,based on the four aspects： sand content,cement mixing ratio,water content of raw soil and sand diameter.It is shown that the mixed sand can improve the strength of stabilized soils,in general,the effective cohesion increased and then decreased with the amount of mixed sand increased,the turning point of the doped amount of sand is the best amount of mixed sand（about 10%）,while effective friction angle increasing continuously.The cement mixing ratio increasing can effectively improve the strength of stabilized soils under a certain amount of mixed sand;as the water content increasing,cohesion of stabilized soil appears as linear decrease relationship approximately;while the internal friction angle remains almost unchanged;and when using cement mortar in the treatment of high water content of soft ground,the appropriately increasing the volume of mixed sand can more sharply improve the mechanical properties of stabilized soil.When the admixture ratio fixed,sand diameter can influence the shear strength of stabilized soil to some extent.In general,the shear strength of stabilized soil is higher when it using the sole sand diameter;and uniformity coefficient Cu tends to the largest,coefficient of curvature Cc tends to the minimum with the sole particle size and good gradation of stabilized soils.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第6期1676-1682,共7页
Rock and Soil Mechanics
基金
江苏省交通科学研究计划项目资助(No.04Y01)
广东省交通厅科技项目资助(No.200903)
江苏省普通高校研究生科研创新计划资助项目(No.CX10B_208Z)
关键词
复合地基
水泥土
三轴CU试验
掺砂量
水泥掺入比
砂料粒径
composite foundation
cement-soil
CU triaxial test
sand content
cement content
sand diameter
